In the tidaldifference daily variations, there is a period of half lunar month of syzygy spring tides related to the phase of the moon.
在潮差逐日变化的半个朔望月的周期里，有朔望大潮，它与月相有关。
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Its regularities, difference of the tidal area environment and adaptable plants have been shown by the investigation and analysis, providing the scientific bases for the plantation in the tidal areas.
A 2-d tidal flow mathematical model of Xinghua Bay based on irregular triangular grid finite difference method was set up and numerical simulation of tidal flow field was carried out.